Automatic control for phonographs



Filed Nov. 1927 5 Sheets-Sheet ATTORNEY J PF. @TQQKTQN 5fi73 AUTOMATICCONTROL FOR PHONOGRAPHS FiledNov. l, 192'? 5 Sheets-Sheet 2 W AT TORNEYJune 4-, 1929. J. P. STOCKTON AUTOMATIC CONTROL FOB PHONOGRAPHS FiledNov. 1, 1927 s Sheets-Sheet 5 ATTORNEY Patented June 4, 1929.

PATENT OFFICE.

UNITED STATES JACK POTTER STOCKTON, OF-SPBING LAKE, NEW JERSEY.

AUTOMATIC CONTROL FOR PHONOGBAAPHS.

Application filed November 1, 1927. Serial No. 230,225.

Most disk type phonographs records nowavailable are provided with soundgrooves of uniform pitch spaced about one'h-undred to the inch, and alsohave additional grooves in- I side the playing surface which communicatewith the sound grooves to receive the stylus on the reproducer. Thestylus is thus carried from the last groove of the playing surface intothese special grooves so that the reproducing means is movedaccordingly. These groves have not been standardized by the variousmanufacturers of phonograph records. They take various forms and sizesaccording to the fancy ofthe maker. Some of the manufacturers usegrooves which are concentric with the center of the record, while othermanufacturers use other, grooves which are eccentric with'respect to therecord center. These concentric grooves are at various radii and theeccentric grooves are of various diameters and are placed at various offcenter distances from the center of the record.

Inasmuch as the sound grooves are in the form of aspiral about thecenter of rotation of the record, and are closelyspaced to economizein'space. it results that the stylus and its support (generally a tonearm) mayhave a substantially uniform angular movement about the pivotofthe support as the stylus is carried in toward'the center of therecord by the sound grooves. In all cases, the various eccentric orconcentric grooves. above rewill of course be dependent upon the pitchof the groove carrying the stvlus in toward the centerof the record, andthe vangular extent of the groove having the increased pitch.

The concentric form of special groove in the record hasbeen utilized toactuate or control various automatic stop mechanisms and switchmechanisms for stopping the phonograph or for initiating the actuationof a repeat mechanism in an automatically repeating phonograph. Othershave provided mechanisms forthese purposes which operate in response tothe outward movement of the stylus and tone arm caused by the eccentricgroove.

.The present invention contemplates the provision of a mechanism whichwill function on any or all of these forms of records to actuate theautomatic switcher repeat or record changing mechanism after thecompletion of the playing of a record. With the present mechanism one isable to use a much wider selection of records than is possible where themechanical features of the phonograph restrict the records to those of aparticular manufacturer; for, with the present device the automatic stopand automatic repeat or record change mechanism may function the same onany or all records wherein greatest inward movement of' the stylus is aconsiderable distance from the center pin, and the present inventioncontemplates that the automatic control device will funeti on wheneverthestylus is carried in'closer than this position. In a few cases therecords may have no special grooves, or the special groove may be poorlyformed or worn so that the stylus refuses to follow it. 'The presentinvention provides for such cases as this, and

' the automatic control functions upon the turn table-making apredetermined number of revolutions after the stylus has been brought toa predetermined position. Thenumber of .such revolutions is greater thanrequired for the completion of the playing of a record having the most.closely placed special groove. I

I hare discovered that the automatic operation of a control device maybe most conveniently obtained by making use of differential actionbetween two members. To obtain this differential action one of themembers is connected to the support for the sound reproducing means soasto be moved byit at 55 reproducing means is swung beyond a predeaspeed which is determined by the pitch ofof the second member when thestylus isbrought into the inner part of the record surface. This motoroperated drive for the second member is preferably timed so that it willmove this member at the same speed that it was moving when under thecontrol of the stylus. In this manner the two. members may be moved at'the same speed and will -maintain the same relative position eventhough one is being moved by the stylus and theother is being operatedfrom the motor by suitable mechanism. As. however, the

speed of this second member is then dependent upon the motor speed, itwill be apparent that it will remain relatively stationary with respectto the first member untilthis first member is given a sudden impulse dueto an increase of pitch in the record groove. While various mechanismsmay be employed for bringing about this differential movement. a simpleform of mechanism for the purpose may preferably include a stationarymotor .driven worm and afollower for the worm carried on or supported bythe second member above referred to. v

' Where the present invention is intended for controlling either theturn table motor or the auxiliary motor of the automatic record changeor repeat mechanism, suitable electric switching connections-may becarried by the swinging member and interconnected with the follower forthe worm so as to be opened or'closed as the case may be whenever thedif-,

' ferential movement takes place.

The invention also contemplates the auto-; 'matic resetting of all the.parts when the tone arm or reproducer support is swung back toward theinitial position to begin playing a record. This is preferablyaccomplished by a suitable arrangement of-stops, links.

and interlocking connections so that the parts y are re-set in-positionto again function automatically. The invention also contemplates theprovision of a limit stop which will actuate the control device wheneverthe sound termined'position, and also the provision of a manuallyoperated means for actuating the" device at any time. I I

The invention is capable of being embodied in a number of mechanicalforms, one of which is shown in the accompanying drawings together withsuch modifications as-to show adaptations of the invention for carryingbut the various purposes above referred to, it beingespeciallymnderstood that the drawings are for the purposeofillustration only and are-not to be construed as adefini- In thesedrawings: Figure 1 isv a top plan view of a phonotion of the limits ofthe invention.

graph showing the turn table, tone arm and automatic control arrangedfor controlling the-turn table motor;

Figure 2 is a top plan view of the control device showing in full linesthe position which it assumes during theplaying of an early portion ofthe record and in dot and.

dash lines-the position which it assumes during the playing of the laterportions of the record;

Figure 3 isafragmenta-ry sectional view taken on theline 3 of Figure 2in the direc-. tion of the arrow and showing the circuit for the turntable motor closed;

Figure & is a fragmentary view showing the position of the parts whenthe stylus is traversing the portion of the record of greater pitch andjust prior to the release of the trip Figure 5 is a view similar toFigure 2 showing in full lines the position the parts assume after theactuation of the trip mechanism, and in dot and dash lines the positionof the parts just before they-are reset by the return movement of thereproducing means Figure 6 is a fragmentary sectional view taken on theline 66 of Figure 5 showing the circuit for the turn table motor open;

Figure-7 is an enlarged fragmentary view of the, latch;

Figure 8 is an elevational view taken in the direction of the arrow 8 ofFigure 5' with the parts in the position shown in full lines in Figure5;

F'gure'Q-is a sectional iew showing the contacts arranged forcontrolling an auxiliary motor which actuates a repeat or automaticrecord change mechanism, the'parts being shown in the position shown inFigure 5;

Figure 10 is a-top plan view of a form of automatic stop adapted for usewith spring motor phonographs, parts being shown in seciion below thetable of the phonograph; an

Figure 11 is a sectional view taken on the line11'11 of Figure 10. I

.VVhile the automatic control contemplated ous forms of soundreproducing machines, it is for convenience here shown as being usedwith a conventional phonograph having a.

turn table '10, tone arm 11, reproducer 12 and stylus-13. The device,however, may be used with other forms of phonograph records and withelectric pick up devices. The tone arm 11, which acts as a swinging armto support the reproducing means, is pivoted to swing about an axis 14and carries with it a short arm-15 which may, as here shown, he placedabove the table 16 of the phonograph.

by the present invention may be used on varlbe described.

1f the arm is placed above the ctable, it is n'ovided with.adownwardly'bent end 17 placed underneath the table 16 as indicatedindotted lines in Figure 1.

The swinging arm 17 carried by the supporting arm and reproducing meansis cooperatively associated with a movable member 20 so that this membermay move with the tone arm during the latter part of the playing of arecord. In the form of invention herein shown the member 20 .is in theform of a long fiat arm pivotally' mounted at 21' on a suitable support22 and slidable along aguide 22. The form of connection provided betweenthe parts 17'and 20 includes a slot 23 carried in a lateral extension 24on the arm 20. This slot is so arranged that the front end of the slotis engaged by the extension 17 of the; arm during the playing of thelatter part of .the record so as to be carried in' a clockwise directionby the stylus as it traverses the-record grooves, and at a speeddetermined by the-pitch of the sound groove. I

' A second movable'member is here shown in the form of a long, thin,flat arm 25, which extends alongside the arm 20. It is pivoted to thearm at 26 and an expansion spring 27 interposed by these arms acts tohold them separated in the position shown in'full lines. The distancethat they can separate,however. is limited by means of a cross strapfastened toihe arm and hooked over a pin 29 on the arm 20. Thisarrangement of parts permits the arms 20 and 25 to swing bodily as aunit about the pivot 20 J'when the pin 17 reaches the end of the slot23. There is, however, nothing to prevent moving the arm 20 toward thearm 25 when that arm is held stationary or compelled to move at arateslower than the movement produced by the advance of the tone arm.

One of'the manyforms of mechanism for maintaining the advance of the arm25 at the same rate that the arm 20 is moved by the stylus is shown inthe drawings, and will npw The arm 25 pivotally supports two members 30and 31 cooperatively associated for the purpose above referred to. Themember 31 which acts as a trigger or detentis pivoted on arm 25 at 32.It carries a long arm 33 which is adjacent the end 34 of the swingingarm 20. The detent arm 31 also is providedwith a short arm 35 whichcarries a downwardly extending pin 36 to cooperate with a notch 37 inthe adjacentend 38 of the member 30. The. member 30 is pivoted at 39,and besides being provided with the notched end 38 for the pin 86, italso carries a downwardly extending portion 40, serrated as shown at41,. to cooperate with a worm 42 driven at a constant speed by the turntable motor. In order to hold the pin 36 in the notch 37, a spring 43 isprovided between the movable member 25 and the left end 44 of the member80. p

In the form of construction illustrated in Figures 1 to 8, inclusive,the arm 25 is provided with laterally extending contact car- 'rier 45which may conveniently be in the form of a strip of insulating material.The

lower end 46 of this extension carries two spring contact members a7 and48 shown more clearly in Figures 3 and 6. These spring-contact membersare in contact when the. parts are in the position shown in Figures 2and 3 and are connected to the phonograph motor M by leads 50 and 51 sothat the turn table motor is operated. The' arm 44: of the member 30 isprovidedv with wedge shaped insulating membe 52,for the purpose to bedescribed.

Assuming that the parts are in the position shown in -Figure 2 andthatthe phonograph is in operation, the movement of the parts will be asfollows: During the playing of the latter part of the record. the arms20 and 25 and all the parts carried by them will move in a clockwisedirection as a unit pivoting about the center 21. The worm 12 iscontinuously revolving being driven by the phonograph motor and soon theserrated edge 41 of the locked member 30 will engage with the threads ofthe worm. This engagement will take place when thestylus is at apredetermined distance from the center of the record, which mayconveniently be such that about one-quarter to threeseighths of an inchof playing surface is-yetto be played. As the interlocked members 30 and31 are both carried on the arm 25 these three members and partsconnected to them may move about the pivot 26. As soon as the serratededge engages the worm, it will be apparent that .the arm 25 and theseparts carried by it will be moved at speed determined by the worm.. Asthe parts are preferably so proportioned that. the speed of the part 25when driven by the worm is the same as the speed which it ll7ltl 0 whenbeing moved by the stylus, therewill be no relative movement of theparts 20 and 25-. In. other words, they will maintain the same spacingwhich they formerly had and all the parts will move in a clockwisedirection 1 5 as indicated in the dot and dash lines of Figure 2. Inorder to insure thatthe device will function the same on all recordswhich have approximately the same pitch, the worm is geared to run at. aspeed corresponding to the 1 0 record having the least grooves per inch.This will cause the worm toinove both arms 20 and 25, taking the drivefor arm 20 away from the-extension 1.7.. This extension, however. willtrail the arm so closely that subsequent operations will be carried outproperly. lVhen, however the stylus moves out of the sound grooves intothe special control groove, it must as above pointed out, move at ahigher rate owing to the increased pitch of this portion of-the soundgroove While this movement may take place in a portion of therevolution, it will be obvious that this movearm 33 will turn thedetentarm in a clockwise ment will bring the tip 34 of the arm over toward thetip 33 of thejdetent arm 31 as shown in Figure 4. As the arm and partscarried by it are now under the control-of the worm 42, it will beapparent that these partscan notbe bodily removed by the engagement ofthe parts 34 and 33 and hence-the pressure applied by the arm 34'against the direction about the pivot 32 thereby releasing the pin 36'from the notch 37andpermitting the spring 43 to swing thelmember 31about thepivot 39. .Thiswill shift the parts from g the dot and dashline position of Figure 2 to the full line position of Figure 5.

Referring now to Figures 5, 6 and 8, it will be noted that-the serratededge 41 of the mem ber has been released'from the worm 42 and that thespring 43 has forced the insulating member 52 in between the contacts 47and 48 thereby opening the 'circuit-forthe turn table motor M andstopping-it.

To reset the control mechanism and. close the motor circuit, it ismerely. necessary to swing the parts back to the dot and dash lineposition of Figure 5. In the form of construction here shown, thismovement will be accomplished by swinging the tone arm back toward theposition for commencing the playing of; a record. During this returnmovement of the tone arm, the extension 17 moves back to the upper endof the slot 23and then j moves the parts to the dot and dash linesDuring this movement,

shown in this figure. the arms 20 and 25 bodily move as a unit. Aresetting link 53 is carried bya .pin 54 entendingupwardly from an arm55 of detent 31. The link 53' is slotted as shown at 56 and is.carricdon a pin 57 carried on a link- 20. Itis brought against a stationaryabutmcnt 58. continued movement of the tone arm will cause the detentmember 31 to turn aboutiits aXi-s 32-bringing the pin 36against the edge59 of the member 30 causing it to l swing about its axis until the pin36 enters the notch 37. at which time the detent mecha-nism willbe againlocked in theposition indicated in Figure 2. phonograph motor M will nowbe closed and the'motor will again start in operation;

If desired, a limit stopmay be conveniently arranged to cooperate withthe form of mechanism above described. This limit stop may take thefornrof a stationary cammcm-ber 60 mounted in a position to be engagedby a pin 61 carried on the arm 35 of the. detent member 31. It will bein such a position that the movement 'of the tone arm in a clockwisedirection beyond. a predetermined amount will bring thepin (31 againstthe cam 60.[ This will cause. a-clockwise{movement The switch for theofthe detent 31 about the the locked member 30. Y

- This limit stop also operates to insure the functioning of the controlmechanism after pivot 32 releasing the completionof the playing ofrecords not I provided with a control groove orwherein the grooveleading 1nto the control groove is too low in pitch or worn so thestylus refuses to' follow it, In cases such as these the worm 42 Wlll'continue to move the arm 25 and parts earned-thereby lnwardly. carryingthe arm 20 along with it. After a short time, these parts will passbeyond the dot and dash.

line position of igure 2 to bring the pin 61 against the cam 60 therebyreleasingthe locked member 30. This insures'that the control devicefunctions within a predeterminedtime after the'stylus has brought thetone arm past apoint'at which the worm assumes the drive of part of thecontrol device.

.A manually operable device for stopping the motorat any timeven thoughthe playing of the record hasn'ot been completed is indicated in Figures1' and S. It is suitably mounted on the underside of the table 16 of thephonograph. As here shown, a length flexible steel wire 62 is mounted toswing about a' support 63 connected to anacccssible knob 64 on top ofthe phonograph table.

-.The parts are so arranged that the tip of the wire-62 inay engagetheupwardlyextending pin 54 toistrike it a light blow when the knob 64is turned in a clockwise direction.

The engagement of the part 62 with this pin. 54 will break the toggleconnection and release the parts so that the spring 43 may actuate thesame and open the motor switch The wire 62 is flexible enough so thatthe continned movement of the'knob 55 will permit matic controlmechanism, is, however, suit able for automatically cont-rolling anauxiliary motor used in an automatic repeating or record changingphonograph. The only changes necessary in the structure of the partsshown in Figures 1 to.8, inclusive, is, to rearrange the contactmechanism. Instead of providing normally closed contacts such as shownat 47 and 48 in Figure 2, and opening these contacts by means of aninsulating mem her 52, the-control device will now be provided withnormally opened contacts 47 and 48 as indicated in Figure 9- and insteadof using an insulating member between thecontacts, the device will nowbe provided with a conducting plate 52 insulatively carried on the arm44 of'the member 30. lVith this and will continue to run until themechanism.

is reset. It is ofco'urse contemplated that auxiliary switch mechanismwould be used for controlling the motor M in case it was desired to haveit' operate when the switch contacts 47 and 48' were electricallydiscnnected. Reference is now made to Figures and 11 which illustrate aform of automatic stop'sultable for use with phonographs having springmotors. Corresponding reference characters are applied to these figuresforparts which may be the same as those previously described in detail;i

A tripping arm 70 is hingedly mounted at 71 on the member 25 andoverlies the arm 44 of the member 30. The arms and and all parts carriedby the same operate in the same manner as has been previously describedl so that the member is released upon the completion of the playing ofa. record (or upon engagement with the limit stop, or operation of therejecting device), whereupon the spring 43 throws this lever in acounter clockwise direction. ,As will be clear from Figure 10', themovement of the member 30 will cause thetripping arm to be swungupwardly on its pivot.

, Suitablebrake mecliiinism is mounted on theunder side of thephonograph table 16. f

Ashere shown this brake mechanism includes a friction member 72 adaptedto engage the side of the turn table 10. This friction memher is carriedon a bell crank 73 pivoted at 7 4 on a bracket 75 and connectedby meansof a link 7 G with a lever 77. The left hand end 78 of the lever 77 iscooperably engaged with a locking dog 79 held against it by means of aspring 80. The locking dog 78 is in the form of a bell crank leverhaving a long, lower arm 81 ov'erlying the tripping member or arm 70which is normally out of contact with it. 7

During the playing of a record the mechanism carried on thepivot 21 willmove clockwise a sufficient amount to bring the tripping member 70underneath the arm 81 of the detent member 79. The camming action of themember 30 against the tripping member 70 will cause this member to pressupwardly on the underside .of the bell crank 81' thereby tensioning thespring and moving the? detent away from the lever 77, whereupon a spring82 will force. the brake shoe over neath the end of the lever 77 andlocks the brake shoe out of position, permitting the spring motor tostart "rotating the record tablet. i

It will be noted that'in the form of construction illustrated in Figures10 and 11, the release of the brakeshoe mechanism is accomplishedwithout any tendency to swing the members pivotedabout the center 21 on'their vertical axes. This isof considerable importance because thesemembers are so light in weight that they would easily swing on the pivot21 if any attempt were made to develop pressure in a horizontal plane.action on these pivoted parts is in a vertical direction which is easilytakencare of in the supports for the'member 20 with no tendency to turnthe member 20 on its pivot.

Where it is desired to utilize the present form of automatic controlmechanism in a record. changing mechanism or in an automatic repeatingphonograph wherein these record changing and automatic repeatingfunctions derive power from'the same motor that operates the turn table,it will The sole rebe obvious that one can utilize a trip mechanism ofthe form shown in Fi ures 10 and 11 for shifting a suitably locateclutch which couples the phonograph motor to the record change andrepeat mechanism.

It is obvious thatthe invention may. be embodied in many forms andconstructions, and

I wishitsto be understoodthat the particular forms shown, are but a fewof the many forms.

Various modifications and changes being pos sible, I do not limit myselfin any way with respect thereto.

I claim! 1. The, combination chine'having a rotatable record support, a

driving motor for therecord support, and

sound reproducing means including a stylus cooperative with soundgrooves on the sound record and moved thereby across said sup- N port,ofa control device automatically brought into operation upon themovement of the reproducing means toward the center of the recordsupportat a speed greater than the normal speed of approach brought about bythe sound grooves, said device including a member controlled directly-bythe reproducing means and a-second member operating at a predeterminedspeed relative to the speedof the record support and intercon- :nectedwith the first member to function the control device.

2. The combination with a talking machine having a rotatable recordsupport, an electric motor for driving the record support, and soundreproducing means including a stylus cooperative with sound grooves onthe sound record and moved thereby across said support, of a switch inthe motor circuit which opens automatically in response to a movement ofthe reproducing with a talking mameans toward the center of the recordsupport at a speed greater than the normal speed of approach broughtabout by the sound' grooves, and operating means for said switch, saidmeans including a member controlled directly by the reproducing meansand a second member operating at a predetermined speed relative to thespeed of the record support and interconnected with the first member tofunction the switch.

3. The combinationwith a talking ma-, chine having a rotatable recordsupport, a

driving motor for the record support, and sound reproducing meansincluding a stylus cooperative with sound grooves on the sound recordand moved thereby across said support, of a control device automaticallybrought into operation upon the movement of the reproducing meanstowardthe center of the record supportiat a speed greater than thenormal speed of approach brought about by the sound grooves, said deviceincluding two members operable simultaneously by the reproducing meansduring a portion ofthe movement thereof, motor operated driving meansfor thereafter assuming the driveot -one of said members withoutsubstantial change in speed whereby differential action between saidmembers is brought about by said increased speed, and mechanismresponsive to said differential action for functioning said controldevice.

4. The combination with a talking machine havinga rotatable recordsupport, an

electric motor for driving the record support, and sound reproducingmeans includmg a stylus cooperative with sound grooves on the soundrecord and moved thereby across said support, of a switch in the motorcircuit which opens automatically 1n re-;

sponse to a movement of the reproducing means toward the center of therecord support at a speed greater than the normal speed of approachbrought about by the sound grooves, and operating means for said switch,said means including two members operable simultaneously by thereproducing means during a portion of the, movement thereof,motoroperated driving means for thereafter assuming the drive of one ofsaid members without substantial change inspeed whereby difierentialaction between said members is brought about by said increased speed.

5. The combination with talking niachine having a rotatable recordsupport, a

driving motor for the record support, and sound reproducing meansincluding a stylus cooperative with sound grooves on the sound recordand moved thereby across said, support, of a rotatable member actuatedby the motor at a speed proportional to the speed of the record support,a stylus actuated member movable at a speed dependent upon the pitch ofthe record groove, an intermediate member movable by the stylus actuatedmember throughout a predetermined range of movement thereof and into aposition whereupon it is actuated by the rotatable member at uniformspeed, and mechanism .responsive to differential action between theport, of a worm actuated. bythe motor at a I speed proportional to thespeed of the record support, an 'arm actuated by the stylus at a speeddependent upon the pitch of the record groove, a second arm movablycar-- ried by the first arm and movable therewith, a toothed membercarried by thesecond arm and engageable with the worm when the stylushas actuated the first arm to a predetermined position, whereupon theworm may contmue the movement'of thesecond arm at the same speed,andmechanism rcsponsive to differential action between the two arms foractuating a phonograph control device.

v 7; The combination with a talking machine having a rotatable recordsupport, a driving motor for the record support, and sound reproducingmeans including a stylus cooperative with sound grooves on the soundrecord and moved thereby across said support, of an arm actuated by thestylus at a speed proportional to the pitch of the recordgroove, a sec-0nd arm pivotally carried by the first arm and normally having a fixedposition relative thereto, a motorv drlven worm adjacent the second arm,and a follower for the worm carried by the second arm and engageablewith the worm to actuate the arm at the same speed it is normally movedby the stylus actuated arm whereby the arms move in-unison so long asthe record groove has uniform pitch and a differential movement of thearms is brought about by a variation of pitch of the record groove.

. 8. The combination with a talking machine having a rotatable recordsupport, a driving motor for the record support, and sound reproducingmeans including a stylus cooperative with sound grooves on the soundrecord and moved thereby across said support, of

an arm actuated by the stylus at a speed proportional to the pitch ofthe record groove, a

second arm pivotally carried by the first arm 'and normally having afixed position relative thereto, a motor driven worm adjacent thesecondFar-m, a follower for the worm pivotally carried by the second armand a detent for locking the follower in position to become engageab lewith the worm to actuate the arm at the same speed itis normally movedbythe stylus actuated arm whereby the arms move in unison so long as therecord groove has uniform pitch and a difierential movement of the armsis brought about by a Variation of pitch of the record groove, thedetent-being disengaged upon said differential movement.

The combination with a talking machine. having a rotatable recordsupport, a driving motor for the record support,'andsound reproduclngmeans including a stylus cooperatlve with sound grooves on the soundrecord and moved thereby across said support; of

an arm actuated by the stylus at a speed proportional to the pitch ofthe record groove,

a second arm pivotally carried by the first arm and normally having afixed position relative thereto, a motor driven worm adjacent the secondarm, a follower for the wormcarried by the second arm and engageablewith the worm to actuate the arm at the same speed it is normally movedby-the stylus actuated arm whereby the arms move in unison'so long asthe record groove has uniform pitch and a differential movement of thearms is brought about by a variation of pitch of therecord groove, andmechanism responsive to said differential movement for actuating aphonograph control device",

10, The combination with a talking machine having a rotatablerecord'support, a driving motor for the record support, and

' sound reproducing means including a stylus cooperative with soundgrooves on the sound record and moved thereby across sa1d support,

of an arm actuated bythe stylus at a speed proportional to'the pitch ofthe record groove,

a second arm pivotally carried by the first arm and normally having afixed position relative thereto, a motor driven worm adjacent the secondarm, a follower for the worm to actuate 'the'arm at the same speed itis'inormally moved by the stylus actuated arm whereby the arms move inunison so long as the record groove has uniform pitch and a differentialmovement of the arms is brought about by a variation of pitch of therecord, and phonograph controlling trigger mechanism mounted on thesecond arm, said trig-- ger mechanism bemg released .by a suddenmovement of-the first arm. i

11. The combination with a talking ma chine having a rotatable recordsupport,-a

driving motor for the record support, and

sound reproducing means including a styluscooperative with soundgrooveson the sound 'record and moved therebv across saidsupw port, ofan'arm actuated by the stylus at a speed proportional to the pitch oftherecord groove, a second arm pivotally carried by the first arm andnormally having a fixed posi tion relative'theretm a motor driven wormadjacent the second arm, a follower for the worm to actuate theiarm atthe same speed] it is' normally moved by the stylus actuated arm wherebythe arms move inunison so long as the record groove has uniform pitchand a differential movement'of the-arms is brought-about by a variationof pitch'of the record groove, phonograph controlling trigger mechanismmounted on the second arm,

said trigger mechanism being released by a sudden lDOVQIllOIlt of-thefirst arm, and means to reset the trigger mechanism whenthe arms areswung backward to restore the reproducing-means to starting position.12. In a phonograph, the combination with a motor driven turntable, arecord, and a movable arm earrying a reproducer and stylus, the recordhaving a groovedplaying surface and a groovewhich suddenly moves the arminwardly after the completion of the playing of a record, of phonographcontrol mechanism sensitive to such sudden inward movement'of the armwhereby the mechanism will function only after the completion of theplaying of'a record. w

In a phonograph the combination with a motor d riven turntable, arecord, and a movable arm carrying a reproducer and stylus, the recordhaving a grooved playing surface and a groove which suddenly moves thearm inwardly after the completion of the playing of a record, ofphonographcontrolinechanism a groove which suddenly moves the arminwardly after the completion of the playing of a record, of a switch inthe motor circuit and switch operating mechanism sensitiveto .such'sudden. inward movement of the arm wherebythe mechanism will functiononly afgerthe'completion of the playing of a reer 151 In a plionographthe combination. with a movable arm, a stylus on the end of the arm,

a rotating turn table, and a disk record on the turn table, said recordhaving a playin surface for cooperation with the stylus and a 7 grooveinside the playing suifaceinto which the stylus passes afterco'mpletionof the playing of a record, a portion of said groove hav-' ing asubstantially greater pitch than the grooves of the playing surface, ofphonograph control mechanism, and means for setting said 7 phonographcontrol mechanism into opera tion in response to the acceleratedmovement of thearm brought about by the portion of the groove of'greaterpitch.

16; In a phonograph, the combination with amovable arm, a stylus on'theend of the arm,

a motor driven turn table, and a disk record and a groove inside theplaying surface into which the stylus passes after completion of playingof the record, a portlon of said groove having a substantially greaterpitch than the grooves of the playing surface, ofa switch in the motorcircuit, switch control-mechanism,

and means for operating the switch control mechanism in response to theaccelerated movement of the arm brought about by the portion of thegroove of greater pitch.

17. In a phonograph, a disk record having a playing surface and acontrol groove inside the playing surface to receive the stylus aftercompletion of the playing of the record, a por tion of said controlgroove being of greater pitch than the grooves of the playing surface,

and a phonograph control device set into operation while the stylus istraversing the said the worm when the follower isin'engagement portionof greater pitch.

' 18. In a phonograph, a diskrecord having a'playing surface and acontrol groove inside the playing surface to receivethe stylus aftercompletion ofplaying of the record,-a portlon of said control groovebeing of greater pitch:

than the grooves of the playing surface, a drivingmotor for thephonograph, a motor control switch, and means to open the switch whenthe stylus is traversing the said portion of greater pitch.

{19. In a phonograph, a record having a playing surface and a controlgroove into- Which the stylus passes after completion of the playing ofthe record, a portion of said control groove being'of greater pitch thanthe grooves of the ,playingsurface, and a phonograph control device setinto operation while the stylus 1s traverslng the said portion ofgreater 'pitch, said control device being unaffected by.subsequent.changes of the pitch of the groove. I

20. In a phonograph, a disk record having a playing surface and aneccentrically located control groove. inside .the playing surface toreceive the stylus after completion of the playing of the record, onehalf of said control groove being of greater pitch than the grooves ofthe playing surface, and a phonograph control device set into operationwhile the stylus is traversing the first half of said eccentric groove,said device being unaffected by thereturn movement of the stylus in thesecond half of the groove.

21. In a phonograph, the combination with an automatic control deviceresponsive to v the sudden movement of-the phonograph tone arm broughtabout by the stylus entering a' groove of higher pitch than the pitch ofthe sound grooves, of a manually operable member for releasing theautomatic control device.

22. In a phonograph, the combination with an automatic control deviceresponsive to the sudden movement of the phonograph tone arm broughtabout by the stylus entering a groove of higher pitch than the pitch ofthe sound grooves, .of a fixed'limit stop, against which. the controldevice is brought when the tone arm is Within a predetermined distanceof the center of the turn table, said limit stop releasing the automaticcontrol device. v

23. A phonograph having a stylus actuated movable arm, a motor operatedworm,

a second arm carried on "the first arm, a switch element fixedly carriedby the second arm, a circuit controlling lever mov-g with the worm, thedetent being engageable withthe first arm to releasethe lever.

24. A phonograph having a stylus actuated movable arm, a motor operatedworm,

a member movably carried by the movable arm and supporting two pivotedmembers oneof which 1s a detent member for locking the other in apredetermined position agamst the tension of a spring, said other memberengaging the worm during a predetermined range of movement of the armand being driven thereby, the detent member being engageable with themovable arm .upon an accelerated movement thereof to release the lockedmember and permit the spring to release it from the-worm so that all theparts.

may move free of the worm.

2511K phonograph having a stylus actuated movable arm, a motor operatedworm,

a member movably carried by the movable arm and supporting'two pivotedmembers one of which is a detent member for locking.

vthe other in a'predetermined position against the tension of a spring,said other member engaging the worm during a predetermined range ofmovement of the arm and beingdriven thereby, the detent memberbeing engageable with th'e movable arm upon an accelerated movement thereof torelease the locked member and permit the spring to release it from theworm so that all the parts may-movefree of the worm, and means forresetting the detent into locking position when the arm returns theswinging arm.

26. In a phonograph, a swinging support fora sound reprodu'cingmeans, aswinging arm having alost motion driving connection with the swingingsupport for moving thev swinging arm with the swinging support duringpredetermined portions of its movement, a second member movably carriedby the swinging arm and carrying thereon a spring pressed lever and adetent lever cooperative therewith to lock it in a predetermined position, means to unlock the-spring pressed lever, and means to stop thephonograph when said lever is released.

.27. In a phonograph, a swinging support for a sound reproducing means,a swinging arm having a lost motion driving connection with the swingingsupport for moving the swinging arm with the swinging support duringpredetermined portions of its movement, a second member movably carriedby the swinging arm and carrying thereon a spring pressed lever and adetent'lever co. operative therewith to lock it in a predeterminedposition,'means to unlock. the spring pressed lever to stopthephonograph when said lever is released, and means for re setting thelevers when the swinging support is moved t'oione of its extremepositions.

28. In the control of phonographs, the

method which consists in actuating two members from onepower'source at aspeed proportional to the normal feed of the sound reproducingmeans'of-the phonograph, then changing the'power drive for one member toanother source which actuates it at the same speed, and then actuatingthe other member at a speed in excess of the normal speed to effect adifferential movement between the members, and releasing a third memberwhich frees a control device.

29. In the control of phonographs, the method which consists insimultaneously actuating two arms fromone power source at a speedproportional to the normal feed of the sound reproducing means of thephonograph, then changing the power drive for one of the arms to anothersource which actuates it at the same speed, and then actuating the otherarm at a speed in excess of the normal speed to effect a d'ifieren'tialmove-- ment between the arms, and releasing a third member which trees acontrol device.

30. The step in the method of operating controls for phonographs whichconsists in bringing about a difierential movement between two membersone of which moves at a predetermined speedrelative to the normalmovement of the stylus and a second member which follows the movementsof thestylus. 31. In a phonograph, the combination with- -a' motordriven record support, a record, a

movable arm carrying a reproducer and stylus, the record having agrooved playing surface cooperative with the stylus, a motor drivenmember actuated at a speed proportional to the speed of therecordsupport, a two part control device, both parts of which are actuated bythe movable arm until the stylus brings one of said parts intocooperative relation with the motor driven member whereupon both partsare actuated by their respective drivers at the same speed so long asthe stylus is in a record groove, and a stop against which the motordriven member brings one of said parts after a prede tel-mined number ofrevolutions of the record operated member moving at a speed proportionalto the speed of the record support and against which the control deviceis brought by the movement of the stylus whereupon the motor operatedmember acts to move the control device in the same direct-ion and at thesame speed, and a stop against which the control device-is brought aftera predetermined number of revolutions of the record support.

33. The combination with a talking machine having a rotatable recordsupport, a driving motor for the record support, and sound reproducingmeans including a stylus cooperative with sound grooves on the soundrecord and moved thereby :across said support, of a wormactuated by themotor at a speed proportional to the-speed of the record support, an armactuated by the stylus at a speed dependent upon the pitch of the recordgroove, a second arm movably carried by the first arm and movabletherewith, a toothed member carried by the second arm and engageablewith the -'worm when the stylus has actuated the firstarm to apredetermined position, whereupon the worm may continue the movement ofthe second arm at the same speed, a stop against which the second arm isbrought after a predetermined number of revolutions of the recordsupport, and a and having limited freedom of movement relative thereto,an electric switch carriedby the second arm, normally set triggermechanism carried by the second arm, the switch being open or closedaccording to the position ofthe trigger mechanism, and means to breakthe setting of the triggermechanism when the first arm is brought tooclose to the second arm.

35. A phonograph control device comprising a swinging arm adapted to benormally moved by the stylus during the playing of a record, asecond armbodily carried thereby and having limited freedom of movement relativethereto, an electric switch carried by the second arm, normally settrigger mechanism carried by the second arm, the switch being open orclosed according to the position of the trigger mechanism, and a fixedstop in the path of the trigger mechanism and acting to. break thesetting thereof when the arms are carried beyond a predetermined point.

36. A phonograph control device comprising a swinging arm adapted to benormally moved by the stylus duringthe playing of a record, a second armbodily carried thereby and having limited freedom of movement relativethereto, a worm driven at a speed proportional to record speed, anelectric switch carried by the second arm, the-switch being open orclosed according to the position of the trigger mechanism, one member ofsaid trigger mechanism carrying a follower for the worm adapted to movethe second arm at the same speed that thestylus moves the first armwhereby the spacing of the arms is maintained while the stylus is in thesound groove, and means for breaking the setting of the triggermechanism when the first arm is suddenly moved toward thesecond arm.

.37. A phonograph control device comprising a swingingarm adapted to benormally moved by the stylus during the playing of a record, a secondarm bodily carried thereby 'fandhaving limited freedom of movementrelative thereto, a worm driven at a speed proportional to record speed,an electric switch carried by the second arm, the switch being open orclosed according to the position of the trigger mechanism, one'member ofsaid trigger mechanism carrying a follow- I or for the worm adapted tomove the second arm'at the same speed that the stylus moves the firstarm whereby the spacing of the arms is maintained while the stylus isinthe sound groove, and a fixedstop in the path of the trigger mechanismand acting to break the setting thereof when the worm carries thev andState of New York, thisSlst day of 00- i tober, 1927. JACK PQTTERSTOCKTON,

